Institutional HoldersBeta
Who holds a company, from every 13F filed for the quarter, one row per filer exactly as filed, against the latest share count the company reported.
Share classes (cover page of the 10-Q filed 2026-08-13, as of 2026-08-07)
| Class | Listed | Shares outstanding | Held by 13F filers | % of class | Holders | CUSIP |
|---|---|---|---|---|---|---|
| Common Class A | ARX · NYSE | 118,548,679 | 64,484,068 | 54.4% | 116 | G00894108 |
| Common Class B | not listed | 98,639,873 | — | — |
Each class is compared with its own share count; classes are not added together. A class that is not exchange-listed cannot be held by 13F filers.
Top holders (1 of 1 · 007767106)
change vs 2026-03-31| # | Filer | Shares / principal | % of class | Value | Change |
|---|---|---|---|---|---|
| 1 | HUNTINGTON NATIONAL BANK | 1 | — | $11 | — |
Large holders from 13D/13G (latest per reporting person, last 2 years)
Filed when a holder crosses 5% or changes materially, so often more current than the quarter-end 13F. Percentages are the filer's own, against the share count they used.
| Reporting person | Form | Filed | Event | Shares | % of class |
|---|---|---|---|---|---|
| Glazer Capital, LLC | SCHEDULE 13G | 2026-09-30 | 2026-09-23 | 5,969,101 | 5% |
| Paul J. Glazer | SCHEDULE 13G | 2026-09-30 | 2026-09-23 | 5,969,101 | 5% |
| Capital World Investors | SCHEDULE 13G/A | 2026-05-14 | 2026-03-31 | 5,152,741 | 4.4% |
| ACP Accelerant Holdings, L.P. | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 85,976,902 | 42.9% |
| ACP Insurance Management, LLC | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 90,916,741 | 44.2% |
| Lee-Smith Christopher | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 20,386,940 | 17.4% |
| ONeill Francis James | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 8,079,736 | 7% |
| RADKE JEFFREY L | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 36,750,813 | 29.9% |
| Schwartz Keoni Andrew | SCHEDULE 13G | 2025-11-14 | 2025-09-30 | 90,916,741 | 44.2% |
Source: SEC Form 13F-HR information tables for the quarter ending 2026-06-30 (filed within 45 days of quarter end; amendments applied; values normalised to dollars), the share count from the company's latest 10-K/10-Q XBRL cover page, and Schedule 13D/13G filings. Each row is a legal 13F filer as filed — related entities (e.g. Vanguard's advisers) are not merged. Retail brokerage accounts are not reported on 13F, so the remainder is mostly retail and insiders.